I'm pretty sure that they may be getting a friendly phone call from our NSA every now and then with suggestions to look at a particular vessel. Somehow I'm pretty sure of that. 
The Somali Pirates use inside sources at maritime insurance companies to pick their targets. They know position, course and speed.
The Israelis have much better intel.
I'm going to check the routing on this ship. They may have picked up this cargo in a Black Sea Port, because if it was picked up in a Persian Gulf Port, the Israeli Navy usually does their intercepts in the Red Sea.
Hmm very intersting.. the containers in question were picked up in Egypt.